I am planning to do coils every other plug change. But based on my experience with the X5 I will have them on hand for all plug changes and injector changes, just in case. Either way my first plug change is free although I'm not thrilled about the dealer doing it. I plan to do my second plug change right before warranty ends in case I find they broke something when they did it. The math will almost work out anyway since I get about 8k per oil change.
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